#bttop{
    border: 1px solid #4adcff;
    background: #24bde2;
    text-align: center;
    padding: 5px;
    position: fixed;
    bottom: 35px;
    right: 10px;
    cursor: pointer;
    display: none;
    color: #fff;
    font-size: 11pt;
    font-weight: bold;
}
#bttop:hover{
    border: 1px solid #ffa789;
    background: #ff6734;
}